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Familial aggregation and heritability of schizophrenia and co-aggregation of psychiatric illnesses in affected families

Chou, I-Jun; Kuo, Chang-Fu; Huang, Yu-Shu; Grainge, Matthew J.; Valdes, Ana M.; See, Lai-Chu; Yu, Kuang-Hui; Luo, Shue-Fen; Huang, Lu-Shuang; Tseng, Wen-Yi; Zhang, Weiya; Doherty, Michael

Authors

I-Jun Chou

Chang-Fu Kuo

Yu-Shu Huang

Ana M. Valdes

Lai-Chu See

Kuang-Hui Yu

Shue-Fen Luo

Lu-Shuang Huang

Wen-Yi Tseng

Michael Doherty



Abstract

Strong familial aggregation of schizophrenia has been reported but there is uncertainty concerning the degree of genetic contribution to the phenotypic variance of the disease. This study aimed to examine the familial aggregation and heritability of schizophrenia, and the relative risks (RRs) of other psychiatric diseases, in relatives of people with schizophrenia using the Taiwan National Health Insurance Database. The study population included individuals with affected first-degree or second-degree relatives identified from all beneficiaries (n = 23 422 955) registered in 2013. Diagnoses of schizophrenia made by psychiatrists were ascertained between January 1, 1996 and December 31, 2013. Having an affected co-twin, first-degree relative, second-degree relative, or spouse was associated with an adjusted RR (95% CI) of 37.86 (30.55-46.92), 6.30 (6.09-6.53), 2.44 (1.91-3.12), and 1.88 (1.64-2.15), respectively. Compared with the general population, individuals with one affected first-degree relative had a RR (95% CI) of 6.00 (5.79-6.22) and those with 2 or more had a RR (95% CI) of 14.66 (13.00-16.53) for schizophrenia. The accountability for the phenotypic variance of schizophrenia was 47.3% for genetic factors, 15.5% for shared environmental factors, and 37.2% for non-shared environmental factors. The RR (95% CI) in individuals with a first-degree relative with schizophrenia was 3.49 (3.34-3.64) for mood disorders and 3.91 (3.35-4.57) for delusional disorders. A family history of schizophrenia is therefore associated with a higher risk of developing schizophrenia, mood disorders, and delusional disorders. Heritability and environmental factors each account for half of the phenotypic variance of schizophrenia.

Journal Article Type Article
Journal Schizophrenia Bulletin
Print ISSN 0586-7614
Electronic ISSN 1745-1701
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
APA6 Citation Chou, I., Kuo, C., Huang, Y., Grainge, M. J., Valdes, A. M., See, L., …Doherty, M. (in press). Familial aggregation and heritability of schizophrenia and co-aggregation of psychiatric illnesses in affected families. Schizophrenia Bulletin, https://doi.org/10.1093/schbul/sbw159
DOI https://doi.org/10.1093/schbul/sbw159
Keywords delusional disorders
familial aggregation
heritability
mood disorders
schizophrenia
Publisher URL https://academic.oup.com/schizophreniabulletin/article-lookup/doi/10.1093/schbul/sbw159
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0





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